CSTL
Castle Biosciences, Inc.
NASDAQ · Healthcare · Medical - Diagnostics & Research · US
$32.91
+0.80%0
Insider buys (3m)
67
Insider sells (3m)
-$6.8M
Net value (3m)
+55.7%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Sep 3, 2026 | Oelschlager Kristen M · officer: Chief Operating Officer | Sale | 200 | $34 |
| Sep 3, 2026 | Oelschlager Kristen M · officer: Chief Operating Officer | M-Exempt | 4,152 | $3.38 |
| Sep 3, 2026 | Oelschlager Kristen M · officer: Chief Operating Officer | Sale | 3,952 | $33 |
| Sep 2, 2026 | Juvenal Tobin W · officer: Chief Commercial Officer | Sale | 1,730 | $33 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 956 | $34 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 21 | $34 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 2,129 | $33 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | M-Exempt | 12,428 | $2.39 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 209 | $34 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 257 | $33 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 177 | $34 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 2,505 | $33 |
| Sep 1, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 11,472 | $33 |
| Aug 27, 2026 | Juvenal Tobin W · officer: Chief Commercial Officer | Sale | 9,050 | $35 |
| Aug 26, 2026 | Oelschlager Kristen M · officer: Chief Operating Officer | Sale | 5,223 | $35 |
| Aug 26, 2026 | Oelschlager Kristen M · officer: Chief Operating Officer | Sale | 12,218 | $34 |
| Aug 26, 2026 | Oelschlager Kristen M · officer: Chief Operating Officer | Sale | 7,161 | $34 |
| Aug 19, 2026 | Juvenal Tobin W · officer: Chief Commercial Officer | Sale | 1,730 | $30 |
| Aug 18, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 278 | $30 |
| Aug 18, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | M-Exempt | 1,100 | $2.39 |
| Aug 18, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 2,714 | $30 |
| Aug 18, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 2,306 | $30 |
| Aug 18, 2026 | Stokes Frank · officer: Chief Financial Officer | Sale | 24,908 | $30 |
| Aug 18, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 1,100 | $30 |
| Aug 6, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 8,421 | $31 |
| Aug 6, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 473 | $31 |
| Aug 6, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 2,546 | $31 |
| Aug 6, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 3,374 | $31 |
| Aug 6, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 4,782 | $31 |
| Aug 6, 2026 | MAETZOLD DEREK J · director, officer: Pres. & Chief Exec. Officer | Sale | 556 | $31 |
Institutional positioning
13F filings over the trailing two quarters
New 55Increased 150Reduced 122Sold out 31
| Filer | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 3,291,963 | Aug 7, 2026 |
| BLACKROCK, INC. | Reduced | 2,982,946 | May 13, 2026 |
| RTW INVESTMENTS, LP | Increased | 2,778,335 | Aug 14, 2026 |
| RTW INVESTMENTS, LP | Increased | 2,758,335 | May 15, 2026 |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 1,769,877 | May 4, 2026 |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 1,726,648 | Aug 4, 2026 |
| PORTOLAN CAPITAL MANAGEMENT, LLC | Reduced | 1,350,283 | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1,226,497 | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1,177,522 | May 15, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 1,039,761 | May 7, 2026 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | Reduced | 940,685 | May 15, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 918,668 | Aug 13, 2026 |
| Allianz Asset Management GmbH | Increased | 879,258 | Sep 2, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 861,771 | May 8, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 840,785 | Aug 13, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 3, 2026